RE: Thunder Basin National Grasslands
Most of the areas along the S.D. border are whitetail country mostly. 158 and 22 are pretty much private land. 10 has a lot of N grassland but I' ve never hunted it. No antelope really, but maybe some mulies. 21 has lots of deer. there' s some public land and walk-in area that could hold some for ya. It gets some pressure though. I don' t know about 13 and 14. hope this info helps ya.
Region A is the northern Black Hills, mostly whitetail country. Region C is N of Gillette, the powder river basin, and the east side of the Bighorn Mts. Good Muley huntin. I' m gettin this info off a 2002 non-resident booklet.